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Home/Cars/Ford/F-150/Fourteenth Generation (2021-present)/how to fix engine misfire P0303 code on Ford F-150 Fourteenth Generation (2021-present)

how to fix engine misfire P0303 code on Ford F-150 Fourteenth Generation (2021-present)

Ford F-150 Fourteenth Generation (2021-present)

Error Codes
Severity: highDifficulty: mediumError Code: P03032-4 hours
3 min read
590 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0303 cylinder 3 misfire in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0303
Affected Component
Engine
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before performing maintenance.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or shaking during operation
  • •Decreased acceleration or power loss
  • •Poor fuel economy
  • •Engine stalling at low speeds

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0303.
  2. 2Inspect the spark plug and ignition coil in cylinder 3 for wear or damage.
  3. 3Check the fuel injector operation in cylinder 3 for clogs or malfunctions.
  4. 4Conduct a compression test on cylinder 3 to assess engine health.
  5. 5Inspect wiring and connectors related to the ignition system and fuel injector.
  6. 6Verify fuel pressure with a fuel pressure gauge to ensure proper delivery.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is parked on a level surface.
  • Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

  • Tools Required: Socket set, torque wrench, spark plug socket.
  • Remove the ignition coil from cylinder 3:
    1. Unplug the electrical connector from the ignition coil.
    2. Remove the retaining bolts securing the coil.
    3. Pull the coil out gently.
  • Remove the spark plug:
    1. Use the spark plug socket to unscrew and remove the spark plug.
  • Inspect the spark plug for fouling, wear, or damage.
  • Replace with a new spark plug, ensuring it is gapped correctly.
  • Torque the spark plug to the manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

  • Tools Required: Socket set.
  • If the spark plug is in good condition, check the ignition coil:
    1. Inspect for cracks or damage.
    2. If necessary, replace the ignition coil with a new one.
  • Reinstall the ignition coil by reversing the removal steps.

4. Check Fuel Injector

  • Tools Required: Fuel injector cleaning kit or replacement injector.
  • Test the fuel injector for proper operation:
    1. Disconnect the fuel injector connector.
    2. Use a multimeter to check for resistance (should be within specifications).
  • If faulty, replace the fuel injector:
    1. Remove the fuel rail if necessary.
    2. Remove the old injector and install the new one.

5. Compression Test

  • Tools Required: Compression tester.
  • Perform a compression test on cylinder 3:
    1. Remove the spark plug and ignition coil.
    2. Insert the compression tester into the spark plug hole.
    3. Crank the engine and record the compression reading.
  • Compare the reading to specifications. Low compression may indicate internal engine issues.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Socket set
  • •Torque wrench
  • •Spark plug socket
  • •Fuel pressure gauge
  • •Compression tester
  • •Multimeter

Parts Required

  • •Spark plug (for cylinder 3)
  • •Ignition coil (for cylinder 3)
  • •Fuel injector (if necessary)

Additional Information

Error Code
P0303
Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
7 items
Parts Required
3 items

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